<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1===0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2===0?'':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success"  closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>

                                    </el-col>
                                <!-- 通过for循环嵌套渲染三级权限 -->
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限对话框 -->
        <el-dialog
        title="分配角色权限对话框"
        :visible.sync="setRightDialogVisible"
        width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <template #footer>
                <span class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
                </span>
            </template>
        </el-dialog>
    </div>
</template>
<script>
export default{
    data(){
        return{
            rolesList:[],
            //控制权限对话框的显示和隐藏
            setRightDialogVisible:false,
            //所有权限数据
            rightList:[],
            //树形控件的绑定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            //默认选中节点Id值数组
            defKeys:[],
            //当前即将分配权限的id
            roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods:{
        async getRolesList(){
            const {data:res}=await this.$http.get('roles')
            if(res.meta.status!==200){
                return this.$message.error('获取角色失败')
            }
            this.rolesList=res.data
            // console.log(this.rolesList);
        },
        //根据id删除对应的权限
        async removeRightById(role,rightId){
            //弹窗提醒用户是否删除该权限
            const confirmResult=await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)
            if(confirmResult!=='confirm'){
                return this.$message.info('已经取消了删除')
            }
            // console.log('确认了删除');
            const {data:res}=await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status!==200){
                return this.$message.error('删除用户权限失败')
            }
            this.$message.success('删除用户权限成功')
            role.children=res.data
        },
        //展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId=role.id
            //获取所有权限数据
            const {data:res}=await this.$http.get('rights/tree')
            if(res.meta.status!==200){
                return this.$message.error('获取权限数据失败')
            }
            //把获取到的数据保存到data中
            this.rightList=res.data
            // console.log(this.rightList);
            //递归获取三级节点
            this.getLeafKeys(role,this.defKeys)
            this.setRightDialogVisible=true
        },
        //通过递归的形式，获取角色下所有三级权限id，并保存到defkeys数组中
        getLeafKeys(node,arr){
            //如果当前node节点不包含children属性，则是三级j节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getLeafKeys(item,arr)
            });
        },
        //监听权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys=[]
        },
        //点击为角色分配权限
        async allotRights(){
            const keys=[
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            // console.log(keys);
            const idStr=keys.join(',')
            const {data:res}=await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
            if(res.meta.status!==200){
                return this.$message.error('分配用户权限失败')
            }
            this.$message.success('分配用户权限成功')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>
<style lang="less" scoped>
.el-tag{
    margin:7px;
}
.bdtop{
    border-top:1px solid #eee;
}
.bdbottom{
    border-bottom:1px solid #eee;
}
.vcenter{
    display:flex;
    align-items: center;
}
</style>
